Answer this question truthfully
### Question: What causes Epiglottitis?
### Response: Epiglottitis is a life-threatening disease. The epiglottis is a piece of cartilage at the back of the tongue that closes off the windpipe when swallowing. It keeps food from entering the airways, so you don't cough or choke after swallowing.
Epiglottitis is swelling of the epiglottis, which leads to breathing problems. Swelling of the epiglottis is usually caused by the bacteria Haemophilus influenzae (H. influenzae), although it may be caused by other bacteria or viruses. Upper respiratory infections can lead to epiglottitis. Medicines or diseases that weaken the immune system can make adults more prone to epiglottitis.
Epiglottitis is most common in children between 2 and 6 years old. Rarely, epiglottitis can occur in adults, and it may be easily overlooked in such patients.
The occurrence of epiglottitis has decreased dramatically in the United States since the H. influenzae type B (Hib) vaccine became a routine childhood immunization in the late 1980s.